Watch: The Flaming Lips and Sean Lennon Perform "Lucy in the Sky With Diamonds" on "Letterman"

For "Beatles Week"

The "Late Show With David Letterman" is currently celebrating"Beatles Week", honoring the 50th anniversary of the band's debut appearance on "Ed Sullivan". They're featuring different musical guests covering different Beatles songs each night, starting with Broken Bells, who did "And I Love Her". Last night, they continued the festivities with a performance from the Flaming Lips and Sean Lennon. Watch them do "Lucy in the Sky With Diamonds" below. Tonight's guest is Lauryn Hill. Other performers have included Sting and Lenny Kravitz.